From: Bill Stoddard <stoddard@apache.org>
Date: Fri, 8 Oct 1999 19:07:05 +0000 (+0000)
Subject: Use AcceptEx with an async completion port. What we are gaining here is
X-Git-Tag: 1.3.10~290
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ad9eee16b3a2a2814a5ef8157d1bf7b7acdb1c7e;p=thirdparty%2Fapache%2Fhttpd.git

Use AcceptEx with an async completion port. What we are gaining here is
LIFO dispatching out of the worker thread pool.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@83952 13f79535-47bb-0310-9956-ffa450edef68
---

diff --git a/include/ap_listen.h b/include/ap_listen.h
index 2df13661808..13565e97d06 100644
--- a/include/ap_listen.h
+++ b/include/ap_listen.h
@@ -65,6 +65,9 @@ struct ap_listen_rec {
     ap_listen_rec *next;
     ap_socket_t *sd;
     int active;
+#ifdef WIN32
+    int count;
+#endif
 /* more stuff here, like which protocol is bound to the port */
 };
 
diff --git a/server/mpm/winnt/mpm_winnt.c b/server/mpm/winnt/mpm_winnt.c
index 5eaa6a4519a..4242e75d403 100644
--- a/server/mpm/winnt/mpm_winnt.c
+++ b/server/mpm/winnt/mpm_winnt.c
@@ -90,6 +90,7 @@ static ap_context_t *pconf;		/* Pool for config stuff */
 static char ap_coredump_dir[MAX_STRING_LEN];
 
 static server_rec *server_conf;
+HANDLE AcceptExCompPort = NULL;
 
 static int one_process = 0;
 
@@ -363,7 +364,7 @@ static ap_inline ap_listen_rec *find_ready_listener(fd_set * main_fds)
     }
     return NULL;
 }
-static int setup_listeners(server_rec *s)
+static int setup_listeners(ap_context_t *pconf, server_rec *s)
 {
     ap_listen_rec *lr;
     int num_listeners = 0;
@@ -372,7 +373,7 @@ static int setup_listeners(server_rec *s)
     /* Setup the listeners */
     FD_ZERO(&listenfds);
 
-    if (ap_listen_open(s->process, s->port)) {
+    if (ap_listen_open(pconf, s->port)) {
        return 0;
     }
     for (lr = ap_listeners; lr; lr = lr->next) {
@@ -384,6 +385,7 @@ static int setup_listeners(server_rec *s)
                 listenmaxfd = nsd;
             }
         }
+        lr->count = 0;
     }
 
     head_listener = ap_listeners;
@@ -445,6 +447,7 @@ static int setup_inherited_listeners(ap_context_t *p, server_rec *s)
         }
 //        ap_register_cleanup(p, (void *)lr->sd, socket_cleanup, NULL);
         ap_put_os_sock(&lr->sd, &nsd, pconf);
+        lr->count = 0;
     }
     CloseHandle(pipe);
 
@@ -724,106 +727,126 @@ static PCOMP_CONTEXT win9x_get_connection(PCOMP_CONTEXT context)
     }
 }
 #endif
-static PCOMP_CONTEXT winnt_get_connection(PCOMP_CONTEXT context)
+/* 
+ * Windows NT specific code...
+ */
+static int create_and_queue_completion_context(ap_context_t *p, ap_listen_rec *lr) 
 {
-    int requests_this_child = 0;
-    int count_select_errors = 0;
-    struct timeval tv;
-    fd_set main_fds;
-    int wait_time = 1;
+    PCOMP_CONTEXT context;
+    DWORD BytesRead;
     SOCKET nsd;
-    int rc;
+    context = ap_pcalloc(p, sizeof(COMP_CONTEXT));
 
-    /* AcceptEx needs a pre-allocated accept socket */
-    context->accept_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if (!context)
+        return -1;
 
-    ap_lock(allowed_globals.jobmutex);
+    context->lr = lr;
+    context->Overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); 
 
-    while (!workers_may_exit) {
-        workers_may_exit |= ((ap_max_requests_per_child != 0) && (requests_this_child > ap_max_requests_per_child));
-        if (workers_may_exit)
-            break;
+    context->accept_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
+    ap_create_context(&context->ptrans, p);
+//    context->ptrans = ap_make_sub_pool(p);
+    context->conn_io =  ap_bcreate(context->ptrans, B_RDWR);
+    context->recv_buf = context->conn_io->inbase;
+    context->recv_buf_size = context->conn_io->bufsiz - 2*PADDED_ADDR_SIZE;
+    ap_get_os_sock(context->lr->sd, &nsd);
+
+    AcceptEx(nsd,//context->lr->fd, 
+             context->accept_socket,
+             context->recv_buf,
+             context->recv_buf_size,
+             PADDED_ADDR_SIZE,
+             PADDED_ADDR_SIZE,
+             &BytesRead,
+             (LPOVERLAPPED) context);
+
+    lr->count++;
+//    num_comp_contexts++;
+
+    return 0;
+}
+static ap_inline void reset_completion_context(PCOMP_CONTEXT context) 
+{
+    DWORD BytesRead;
+    SOCKET nsd;
+    int rc;
+    context->lr->count++;
+
+    if (context->accept_socket == -1)
+        context->accept_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);    
+
+    ap_clear_pool(context->ptrans);
+    context->conn_io =  ap_bcreate(context->ptrans, B_RDWR);
+    context->recv_buf = context->conn_io->inbase;
+    context->recv_buf_size = context->conn_io->bufsiz - 2*PADDED_ADDR_SIZE;
+    ap_get_os_sock(context->lr->sd, &nsd);
+
+    rc = AcceptEx(nsd, //context->lr->fd, 
+                  context->accept_socket,
+                  context->recv_buf,
+                  context->recv_buf_size,
+                  PADDED_ADDR_SIZE,
+                  PADDED_ADDR_SIZE,
+                  &BytesRead,
+                  (LPOVERLAPPED) context);
+}
+static PCOMP_CONTEXT winnt_get_connection(PCOMP_CONTEXT context)
+{
+    int requests_this_child = 0;
+    int rc;
 
-        tv.tv_sec = wait_time;
-        tv.tv_usec = 0;
-        memcpy(&main_fds, &listenfds, sizeof(fd_set));
+    LPOVERLAPPED pol;
+    DWORD CompKey;
+    DWORD BytesRead;
 
-        rc = ap_select(listenmaxfd + 1, &main_fds, NULL, NULL, &tv);
+    if (context != NULL) {
+        context->accept_socket = -1; /* Don't reuse the socket */
+        reset_completion_context(context);
+    }
 
-        if (rc == 0 || (rc == SOCKET_ERROR && h_errno == WSAEINTR)) {
-            count_select_errors = 0;    /* reset count of errors */            
-            continue;
-        }
-        else if (rc == SOCKET_ERROR) {
-            /* A "real" error occurred, log it and increment the count of
-             * select errors. This count is used to ensure we don't go into
-             * a busy loop of continuous errors.
-             */
-            ap_log_error(APLOG_MARK, APLOG_INFO|APLOG_WIN32ERROR, server_conf, "select failed with errno %d", h_errno);
-            count_select_errors++;
-            if (count_select_errors > MAX_SELECT_ERRORS) {
-                workers_may_exit = 1;
-                ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_WIN32ERROR, server_conf,
-                             "Too many errors in select loop. Child process exiting.");
-                break;
-            }
+    rc = GetQueuedCompletionStatus(AcceptExCompPort,
+                                   &BytesRead,
+                                   &CompKey,
+                                   &pol,
+                                   INFINITE);
+    context = (PCOMP_CONTEXT) pol;
+    if (CompKey == 999) {
+        if (context) {
+            closesocket(context->accept_socket);
+            CloseHandle(context->Overlapped.hEvent);
+            return NULL;
         }
-        else {
-            DWORD BytesRead;
-            ap_listen_rec *lr;
-            
-            lr = find_ready_listener(&main_fds);
-            if (lr != NULL) {
-                ap_get_os_sock(lr->sd, &nsd);
-            }
-            else {
-                ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_WIN32ERROR, server_conf,
-                             "select returned but there are no ready listeners! Exiting.");
-                break;
-            }
+    }
 
-            rc = AcceptEx(nsd, context->accept_socket,
-                          context->conn_io->inbase,
-                          context->conn_io->bufsiz - 2*PADDED_ADDR_SIZE,
-                          PADDED_ADDR_SIZE,
-                          PADDED_ADDR_SIZE,
-                          &BytesRead,
-                          &context->Overlapped);
-            
-            if (!rc && (h_errno == WSA_IO_PENDING)) {
-                rc = GetOverlappedResult(context->Overlapped.hEvent,
-                                         &context->Overlapped,
-                                         &BytesRead,
-                                         INFINITE); /* TODO: get timeout from the config file */
-            }
-            if (!rc) {
-                if (h_errno != WSAECONNABORTED) {
-                    ap_log_error(APLOG_MARK, APLOG_ERR|APLOG_WIN32ERROR, server_conf,
-                                 "AcceptEx failed.");
-                }
-                continue;  /* go back to select */
-            }
-            requests_this_child++;   
-            context->conn_io->incnt = BytesRead;
-            GetAcceptExSockaddrs(context->conn_io->inbase, 
-                                 context->conn_io->bufsiz - 2*PADDED_ADDR_SIZE,
-                                 PADDED_ADDR_SIZE,
-                                 PADDED_ADDR_SIZE,
-                                 &context->sa_server,
-                                 &context->sa_server_len,
-                                 &context->sa_client,
-                                 &context->sa_client_len);
-
-            ap_unlock(allowed_globals.jobmutex);
-            return context;
+    ap_lock(allowed_globals.jobmutex);
+
+    context->lr->count--;
+    if (context->lr->count < 2) {
+        if (create_and_queue_completion_context(pconf, context->lr) == -1) {
+            /* log error and continue */
         }
     }
-    CloseHandle(context->Overlapped.hEvent);
     ap_unlock(allowed_globals.jobmutex);
+
+    context->conn_io->incnt = BytesRead;
+/*
+    GetAcceptExSockaddrs(context->conn_io->inbase, 
+                         context->conn_io->bufsiz - 2*PADDED_ADDR_SIZE,
+                         PADDED_ADDR_SIZE,
+                         PADDED_ADDR_SIZE,
+                         &context->sa_server,
+                         &context->sa_server_len,
+                         &context->sa_client,
+                         &context->sa_client_len);
+
+*/
+    return context;
+/*
+    CloseHandle(context->Overlapped.hEvent);
     SetEvent(exit_event);
     return NULL;
+*/
 }
-
 /*
  * child_main() - this is the main loop for the worker threads
  *
@@ -844,66 +867,52 @@ static PCOMP_CONTEXT winnt_get_connection(PCOMP_CONTEXT context)
  */
 static void child_main(int child_num)
 {
-    PCOMP_CONTEXT lpCompContext;
-    ap_iol *iol;
+    PCOMP_CONTEXT context = NULL;
 
-    /* Create and initialize the static (unchangeing) portion of the 
-     * completion context 
-     */
-    lpCompContext = ap_pcalloc(pconf, sizeof(COMP_CONTEXT));
-    lpCompContext->Overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL); 
-    ap_create_context(&(lpCompContext->ptrans), pconf);
+//    ap_create_context(&(lpCompContext->ptrans), pconf);
 
 #if 0
     (void) ap_update_child_status(child_num, SERVER_READY, (request_rec *) NULL);
 #endif
 
     while (1) {
-        BUFF *conn_io;
-        ap_context_t *ptrans;
-        int csd = -1;
         conn_rec *current_conn;
-
-        /* Initialize the dynamic portion of the completion context */
-	ap_clear_pool(lpCompContext->ptrans);
-        lpCompContext->conn_io =  ap_bcreate(lpCompContext->ptrans, B_RDWR);
+        ap_iol *iol;
 
         /* Grab a connection off the network */
-        if (osver.dwPlatformId == VER_PLATFORM_WIN32_NT)
-            lpCompContext = winnt_get_connection(lpCompContext);
+        if (osver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
+//            context = win9x_get_connection(context);
+        }
         else {
-//            lpCompContext = win9x_get_connection(lpCompContext);
+            context = winnt_get_connection(context);
         }
 
-
-        if (!lpCompContext)
+        if (!context)
             break;
 
-        conn_io = lpCompContext->conn_io;
-        ptrans = lpCompContext->ptrans;
-        csd = lpCompContext->accept_socket;
+//        ap_note_cleanups_for_socket(context->ptrans, context->accept_socket);
 
-//	ap_note_cleanups_for_socket(ptrans, csd);
 
 #if 0
 	(void) ap_update_child_status(child_num, SERVER_BUSY_READ,
                                       (request_rec *) NULL);
 #endif
-	sock_disable_nagle(csd);
 
-        iol = win32_attach_socket(csd);
+	sock_disable_nagle(context->accept_socket);
+
+        iol = win32_attach_socket(context->ptrans, context->accept_socket);
         if (iol == NULL) {
             ap_log_error(APLOG_MARK, APLOG_ERR, server_conf,
                          "error attaching to socket");
-            close(csd);
+            closesocket(context->accept_socket);
             continue;
         }
 
-        ap_bpush_iol(conn_io, iol);
+        ap_bpush_iol(context->conn_io, iol);
 
-	current_conn = ap_new_connection(ptrans, server_conf, conn_io,
-                                         (struct sockaddr_in *) &lpCompContext->sa_client,
-                                         (struct sockaddr_in *) &lpCompContext->sa_server,
+	current_conn = ap_new_connection(context->ptrans, server_conf, context->conn_io,
+                                         (struct sockaddr_in *) &context->sa_client,
+                                         (struct sockaddr_in *) &context->sa_server,
                                          child_num);
 
         ap_process_connection(current_conn);
@@ -1019,7 +1028,7 @@ static void worker_main()
 	ap_log_error(APLOG_MARK,APLOG_ERR|APLOG_WIN32ERROR, server_conf,
                      "Waiting for start_mutex or exit_event -- process will exit");
 
-	ap_destroy_pool(pchild);
+	ap_destroy_context(pchild); // ap_destroy_pool(pchild):
 #if 0
 	cleanup_scoreboard();
 #endif
@@ -1028,7 +1037,7 @@ static void worker_main()
 
     /* start_mutex obtained, continue into the select() loop */
     if (one_process) {
-        setup_listeners(server_conf);
+        setup_listeners(pconf, server_conf);
     } else {
         /* Get listeners from the parent process */
         setup_inherited_listeners(pconf, server_conf);
@@ -1041,7 +1050,8 @@ static void worker_main()
 
 	signal_parent(0);	/* tell parent to die */
 
-	ap_destroy_pool(pchild);
+//	ap_destroy_pool(pchild);
+        ap_destroy_context(pchild);
 #if 0
 	cleanup_scoreboard();
 #endif
@@ -1051,15 +1061,51 @@ static void worker_main()
     allowed_globals.jobsemaphore = create_semaphore(0);
     ap_create_lock(pchild, APR_MUTEX, APR_INTRAPROCESS, NULL, &allowed_globals.jobmutex);
 
-    /* spawn off the worker threads */
-    child_handles = (thread *) alloca(nthreads * sizeof(int));
-    for (i = 0; i < nthreads; i++) {
-	child_handles[i] = create_thread((void (*)(void *)) child_main, (void *) i);
-    }
-
     /* spawn off accept thread (WIN9x only) */
-//    if (osver.dwPlatformId != VER_PLATFORM_WIN32_NT)
+    if (osver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
+        /* spawn off the worker threads */
+        child_handles = (thread *) alloca(nthreads * sizeof(int));
+        for (i = 0; i < nthreads; i++) {
+            child_handles[i] = create_thread((void (*)(void *)) child_main, (void *) i);
+        }
+
 //        create_thread((void (*)(void *)) accept_and_queue_connections, (void *) NULL);
+    }
+    else {
+        ap_listen_rec *lr;
+        SOCKET nsd;
+        /* Create the AcceptEx completion port */
+        AcceptExCompPort = CreateIoCompletionPort(INVALID_HANDLE_VALUE,
+                                                  NULL,
+                                                  0,
+                                                  0); /* CONCURRENT ACTIVE THREADS */
+
+        /* Associate each listener with the completion port */
+        for (lr = ap_listeners; lr != NULL; lr = lr->next) {
+            ap_get_os_sock(lr->sd, &nsd);
+            CreateIoCompletionPort((HANDLE) nsd, //(HANDLE)lr->fd,
+                                   AcceptExCompPort,
+                                   0,
+                                   0);
+        }
+
+        /* spawn off the worker threads */
+        child_handles = (thread *) alloca(nthreads * sizeof(int));
+        for (i = 0; i < nthreads; i++) {
+            child_handles[i] = create_thread((void (*)(void *)) child_main, (void *) i);
+        }
+
+        /* Create an AcceptEx context for each listener and queue it to the 
+         * AcceptEx completion port
+         */
+        for (lr = ap_listeners; lr != NULL; lr = lr->next) {
+            for(i=0; i<1; i++) {
+                if (create_and_queue_completion_context(pconf, lr) == -1) {
+                    /* log error and exit */
+                }
+            }
+        }
+    }
 
     rv = WaitForSingleObject(exit_event, INFINITE);
     printf("exit event signalled \n");
@@ -1067,17 +1113,19 @@ static void worker_main()
 
     /* Get ready to shutdown and exit */
     ap_unlock(start_mutex);
-#if 0
-    if (osver.dwPlatformId != VER_PLATFORM_WIN32_NT) {
-        /* This is only needed for platforms that use the accept queue code 
-         * (WIN9x only). It should work on NT but not as efficiently as the 
-         * code written specifically for Windows NT.
-         */
+
+    /* Tell the workers to stop */
+    if (osver.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS) {
         for (i = 0; i < nthreads; i++) {
-            add_job(-1);
+//            add_job(-1);
         }
     }
-#endif
+    else {
+        for (i=0; i < nthreads; i++) {
+            PostQueuedCompletionStatus(AcceptExCompPort, 0, 999, NULL);
+        }
+    }
+
     /* Wait for all your children */
     end_time = time(NULL) + 180;
     while (nthreads) {
@@ -1100,7 +1148,7 @@ static void worker_main()
     destroy_semaphore(allowed_globals.jobsemaphore);
     ap_destroy_lock(allowed_globals.jobmutex);
 
-    ap_destroy_pool(pchild);
+    ap_destroy_context(pchild);
 
 #if 0
     cleanup_scoreboard();
@@ -1343,7 +1391,7 @@ static int master_main(server_rec *s, HANDLE shutdown_event, HANDLE restart_even
     HANDLE process_handles[MAX_PROCESSES];
     HANDLE process_kill_events[MAX_PROCESSES];
 
-    setup_listeners(s);
+    setup_listeners(pconf, s);
 
     /* Create child process 
      * Should only be one in this version of Apache for WIN32 
diff --git a/server/mpm/winnt/mpm_winnt.h b/server/mpm/winnt/mpm_winnt.h
index 8b915bec72f..e3cc0bbaf77 100644
--- a/server/mpm/winnt/mpm_winnt.h
+++ b/server/mpm/winnt/mpm_winnt.h
@@ -64,6 +64,21 @@ extern void clean_child_exit(int);
 extern int ap_extended_status;
 extern void clean_child_exit(int);
 
+
+typedef struct CompContext {
+    OVERLAPPED Overlapped;
+    SOCKET accept_socket;
+    ap_listen_rec *lr;
+    BUFF *conn_io;
+    char *recv_buf;
+    int  recv_buf_size;
+    ap_context_t *ptrans;
+    struct sockaddr sa_server;
+    int sa_server_len;
+    struct sockaddr sa_client;
+    int sa_client_len;
+} COMP_CONTEXT, *PCOMP_CONTEXT;
+#if 0
 typedef struct CompContext {
     OVERLAPPED Overlapped;
     SOCKET accept_socket;
@@ -74,5 +89,5 @@ typedef struct CompContext {
     struct sockaddr sa_client;
     int sa_client_len;
 } COMP_CONTEXT, *PCOMP_CONTEXT;
-
+#endif
 #endif /* APACHE_MPM_WINNT_H */